Self-metering rotary pump



Aug- 23 1927' P, c. PETERSEN SELF METERING ROTARY PUMP Filed Aug, 2l.1926 v 2o. Czfetersen,

Patented 23, 712927. I. l 'UNITED STATES l l-csasunv lPrvrlazla'rorFlcE.

ETEB PETEBSENfOF CEDAR FALLS, IOWA,` ASSIGNOB T VIKING ZPUMI'? COMPANY,0F CEDAR FALLS, IOWA.

sam-mrunme :tornar PUMP.

Application led `August 21, 1926. Serial No. 130,665.

My invention relates to improvements in self metering rotary pumps, andthe obJect of my improvement is to provide a pump of this type capableof delivering liqulds at denite volumes per unit of time accordingto therelative speed of rotation of its interacting operating elements, themethod of construction of the same, and the means for control of the relating pressures,

This object I ave accomplished b the means which are hereinafterdescribe and claimed and which are illustrated in the annexed drawings,it being understood that changes in the recise embodiment or 1nventionherein disclosed can be madeV within the scope of what is claimedwithout departing from the spirit of the invention.

In said drawings, Fig. 1 is a front elevation of my device, with partsin section or broken away, the front cylinder head being removed exceptparts shown in section as in operative positions within the pump cyl-vnder. Fig. 2 is an elevation of the mner face of said cylinder head.Fig. 3 is a vlew of my device partially in central, vertlcal,longitudinal section and partially in side elevation, with parts brokenaway.

The pump cylinder 1 of my device has av c linclrical bore closed at therear, open at the front, the open front end being closed by a removablecylinder head 27 secured by means of machine screws 28 passed throughholes 32 in the margin of the head and threaded into sockets 29 in thecylinder end. As shown in Fig. 2, said cylinder head has a cylindricalboss 30 which lits into the forward part of the cylinder bore 2, andthis boss has an eccentric stud 33 projectin into said bore, also acrescental boss 31'wit arcuate convex inner face which latter isconcentric with the stud 33, the said boss 31 and stud 33 having uses tobe hereinafter described.

A cylindrical rotor 24 is rotatably fitted in the bore 2 with its rearfiat face abuttedl upon and in contact with the rear flat wall or backof said cylinder bore, and has a cylindrical shaft 20 mounted in acylindrical bored bearin 8y of a prolonged body part 6 of said c mder 1.The rear part of the body part 6 as the shaft bore 8 enlargedl at 9around said shaft 20 to seat packing 23, the latter retained by means ofa cylindrical plug or gland 22 having on its outer end a pair ofdiametrically opposite ears which engage the end of the body part 6 andare seated vin recesses of a plate 21 secured by screws whose positionsare indicated by dotted lines. A belt wheel (not shown) or other drivingmeans may be mounted on the outer rear end of the shaft 2O to rotate itat any desired Speed, in the direction indicated by thearrow in Fig. 1.

The numeral 13 denotes a reservoir for liquids, such as oil, and for thepurpose of convenience in illustration is shown at orv a little abovethe level of the cylinder 1, but it is to be understood that inpracticeit is permissible to position the reservoir in any desiredrelation to the pump in accordance -with existing conditions.

Thecylinder 1 has ,an inlet port 11 traversing a lateral bom 4 and incommunication with a pipe 12, which may be lon er than shown, andincommunication with. iquid in saidreservoir. The cylinder 1 hasavertically disposed boss 5 apertured to communicate with a discharge oroutlet port back into the reservoir 13 including a valve chamber 16 withinterior valve to control the passage of liquid therethrough from thepump. A branch conduit at 18 leads from the conduit 15 into a pressureage 19 to permit indication of the liqui pressure. Referring to Fig. 2,the cylindricalboss 30 has a, pair of edge recesses 35 and 36 whichafford clearance respectively in the cylinder to the ports 14 and 11 topermit of lunrestricted liquid flow. l

The cylinder body has a vertically disposed boss at 7 in the rear ofsaid boss 5. The boss 7 has an interiorly threaded aperture 34 toreceive the threaded end of a pipe 17 which may lead to any desiredplaces of deposit, such as bearings of mechanisms or g5 motors to supplyliquid lubricants thereto in metered quantities, or into containers forv receiving the metered liquids. The body lpart 6 has a longitudinalpassa e 10 of a determined cross-sectional area o relatively small sizewhich leads from the cylinder bore 2 into the aperture 34 and pipe 17.

The rotor body has one or more passages 26 therethrough and positionedat such a radial .y distance from the axis of the rotor as to passacross the adjacent end of the passage 10 once during each rotation ofthe rotor. By providing any desired number of like and like positionedpassages 26 in the rotor body in one rotation ofthe rotor the un meteredquantities discharged may be multiplied to thus vary the discharge ofthe pump through the pipe 17 in a given unit of time.

The rotor has forwardly projecting crown teeth 2. An idler pinion 37 isloosely rotatably mounted on the stud 33 and -is in interior mesh withsaid crown teeth 25, whereby the idler is rotated in the same directionas the rotor, as shown by the arrow on the idler.

It will be seen, that when the rotor and idler are in rotation, theirteeth interact in such a way as to pump liquid from the reservoir 13positively by Way of the conduit 12 vand port 11 in portions and whichlatter.

are-carried into the tooth spaces of the rotor and idler past the innerand outer faces of the boss 81 to be discharged into the outlet port 14and thence by way of the valvecontrolled conduit 15 to the reservoir. Asthe forward end of each rotor passage 26 is at such a radial distancefrom the axis of the rotor as to be alined with a part of the interspaceof roots of teeth on the idler 37 and the ends of the meshing crownteeth 25, the passages 26 will receive at each rotation in each caselike portions of liquid in said bore 2 as may be forced into thesepassages in turn by the space contracting actions of the meshing teethof the rotor and idler. At each rotation ot' the rotor, therefore, acertain quantity of the liquid is forced through the communicatingpassages 26 and 10 and the discharge pipe 17, and as the rotor may berotated at any desired speed, from 50 to 1800 or more rotations perminute, a stream of liquid is discharged by the pipe 17 of a knownvolume per minute in direct relation t0 the number of revolutions 'perminute. The pressure of the liquid in the conduit 15 may be varied byproper turning of the valve therein, the back pressure being varied tosimilarly aii'ect the uantity by way of the passages 26-10 and (the pipe17. The regulation of the delivery through the pipe 17 is thus llexiblyvaried and as certainly as required for any purpose, the maincirculation by Way of the conduit 12 to the pump and the conduit 15,bein idle.

Having described my invention, what I claim as new, and desire to secureby Letters Patent, is:

1. In a device of the character described, a reservoir, a rotary pumpcylinder in communication with said reservoir and having a dischargepassage of a predetermined areal cross section, and intermeshing rotarypiston devices mounted within said cylinder, one having one or moredischarge passages, each of the samecross sectional area as thefirst-mentioned discharge passage, said devices being shaped andoperative to pump liquid from the cylinder 1nto and throu h saidfirst-mentioned discharge passage to liver it metered therefrom at aquantity discharge depending upon the relative number of rotations ofsaid piston devices, the degree of liquid pressure caused to existwithin the pump cylinder, and the number and size of any such 'liquiddischarge passages 70 which may be in said devices, said last-mentionedpassages being located to periodicallycommunicate with thefirst-mentioned discharge' passage.

2. In a device of the character describelr 15 a reservoir, a rotary umpcylinder in conn-7 munication with saidp reservoir, and Ahaving adischarge conduit, a pressure ga e in communication with said conduit,sai cylinder having its said discharge conduit of a predeterminedcross-sectional area, intermeshing` piston devices rotatably mountedwithin the cylinder operative to pum a liquid fromf'! said reservoirthereinto, an one of the pis-ff' ton devices having one or more aertures offiz 85 like cross-sectional areas and vo urnes, said?"cross-sectional area bein in size and shape` the same as those of saidischarge conduit to register therewith in passing it.

3. A device of the character described, coinprising a rotary pumpcylinder in communication with a supply of liquid and havin a dischargeconduit of a predetermine cross-sectional area, and intermeshed devicesrotatably mounted in said cylinder, one device being mounted idly, theother having an aperture of determined cross-sectional area, shape andvolume, and positively rotated whereby the aperture comes inregistration wi-th and in communication with said discharge conduitduring each rotation of said apertured device, to thereby meter theliquidl discharged through the discharge conduit as delivered by saldaperture of determined volume during the rotation in a given timeof saidapertured device.

4. A self-metering rotary pump, comprising in combination, a li uidreservoir, a hollow closed pump cylin er having an inlet port incommunication with said reservoir, a rotor in said cylinder havingcrown-teeth and one or more apertures each of like predeterminedcross-sectional area and volume, and located definitely with regard tothe nearest ad'acent crown-teeth, arear Wal'l of said cylin er abuttingthe rotor having a discharge passage therethrough of the samecross-Sectional area as that of each of said apertures and positioned toregister therewith during each rotation of the rotor, an arcuate bossonthe opposite cylinder head positioned within the crown-teeth with itsouter wall contacting with certain of the crown-teeth.- a cylindricalstud projecting inwardly eccentrically from said cylinder head, an idlerpinion loosely rotatably mounted on said stud and in mesh interiorlywith said ycrownteeth, the inner arcuate face of said boss contactingwith certain of the idler teeth, and the aperture or apertures of saidrotor being located for communication with the gree of liquid pressurecaused to exist witli- 10 cylinder through an interspace of the teeth inthe cylinder, and to the number, volumes ofthe rotor and idler, whenmeshed, only at and cross-sectional areas of the liquid pasa time whenthe aperture is also in communisages contained in the rotor thatperiodically cation with said cylinder discharge passage register withthe first-mentioned cylinder at each rotation of the rotor, whereby thedischarge passage. 15 quantity of liquid discharged throu h said Intestimony whereof I affix my signature.

discharge passage is metered accor ing to y the speed of rotation of therotor, to the de- PETER CHRIS PETERSEN.

